scope:

This standard gives methods of calculation of heat transfer coefficients and heat transfer rates, for building elements in thermal contact with the ground. It covers slab-on-ground floors, suspended floors, and basements. It includes calculation of the steady-state part of the heat transfer (the annual average rate of heat transfer), and the part due to annual periodic variations in temperature (the seasonal variations of the heat transfer about the annual average). These seasonal variations are obtained on a monthly basis and shorter-term variations are excluded from the scope of this standard. EN 29646-1 gives the method of calculation of the thermal transmittance of building elements in contact with the external air. This standard deals with elements in thermal contact with the ground. The calculation of heat transfer through the ground can be done by numerical calculations which conform with EN 32753. Such numerical calculations also allow analysis of thermal bridges, including wall/floor junctions, for assessment of minimum internal surface temperatures.